12nCr4

Solution

12 n C r 4

495

étapes des solutions

= \frac{n !}{r ! ( n - r ) !}

Insérer

n = 12, r = 4

= \frac{12 !}{4 ! ( 12 - 4 ) !}

\frac{12 !}{4 ! ( 12 - 4 ) !} = 495

= 495

5 n C r 4

6 n C r 5

a r i t hm e t i c m e an 45, 80

a r i t hm e t i c m e an 18, 16, 13, 14, 14

m e d ian 1975, 1983, 2006, 2009, 1947, 1957, 1972, 1978